Next time they call, tell them that you've seen the lawsuits filed against them and that you need to talk to a supervisor to make sure that you are no longer contacted. Enhanced Recovery Corporation is dealing with a few lawsuits [[gotta love Google ).

That's worked for me twice now--the first company had been sued in Michigan, while the second one has a suit pending in federal court. A quick mention of these facts got me a supervisor, and ended the calls.